[bahro]

"According to Doctors Without Borders, which is critical of drug-pricing policies, it costs Gilead $100 to manufacture the 90 pills in the 12-week course."

Sounds more like a $1.11 pill to me. And it seems pretty straightforward to sell something at (a minimum) 90% margin and make money.

[refurb]

That's purely the cost of goods. It completely ignore the cost of R&D.

It's like saying "oh, that CD I just bought only costs $0.30 to press, so $3 is a 90% margin". It's not. You can't ignore the millions that went into recording the music.